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Re: Unprotect Plus, no automatic collection

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39122] Re: Unprotect Plus, no automatic collection
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Thu, 30 Jan 2003 01:06:15 -0500 (EST)
  • References: <b184d4$kqb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Friedrich Laher" <mathefritz at schmieder-laher.de> wrote in message
news:b184d4$kqb$1 at smc.vnet.net...
> when Unprotect[Plus]; Plus[w1,w2] = -1 is commanded
> and then the expanding of a product gives a*w1 + a*w2 + ...
> that is not collapsed to -a + ... automatically, even
> if selecting that a*w1 + a*w1 and
> the applying Simplify to it from al palette, does it.  What
> can be done to automize it?
>
>

Friedrich,

    Unprotect[Plus];
    (a_. ) w1+(a_.) w2 = -a;

    a w1+a w2

        -a


--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565





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